Oil and gas burning furnace



Feb. 11, 1930. E. E. McGlLL f y t 1,746,546 .I OIL AND GAS BURNING FURNACE i `Fi1ed June v25, 1928 a! 25 /z y 49 9 f 4/ ao /41 Patented Feb. 11, 1930 .PATEN'u OFFICE ELWIN E. Ill/ICG'ILL,l OF KANSAS CITY, MISSOURI OIL AND GAS BURNING FURNACE Application led June 25,

and radiator structure which may. be easily and quickly installed in connection with any f the ordinary types of fire boxes in warm air furnaces, in either single or multiple unit 16 assembly, and Which may be conveniently adjusted or repaired, as occasion demands.

y A further primary object of the invention is to provide a type of burner which is characterized by a high ratio of radiant heat 2 0 adapted to be given off from the burner in an efficient well distributed manner, for insuring a maximum rate of heat transfer. InV this connection, it is a purpose of the invention to reduce the amount of air admitted for maintaining combustion -to only the actual minimum required volume and also to stop the admission of such air .at those times when the operation of the burner is interrupted. For efficiency of operation, the ratio of the primary to the secondary air supplied the burner is adapted to be accurately adjusted and controlled, and the arrangement is furthermore such as to be adapted for either manual, or automatic or thermostat control.

In this connection it is also a novel feature of the invention to exclude the admission of air by way of the ash pit of the furnace, in

order to obtain further efficiency with reference to the-air circulation.

Another particularly important feature of my improved burner construction is4 in the `provision of a. burner element having means 4for the usual adjustment ofits primary air supply, in combination with means for either manually or automatically cutting off entirey 1928. Serial No. 287,905.

ly the air supply to said burner element at such times as the flow of fuel thereto is interrupted. Y

With these general objects in view, as Well as various minor objects as will appear`v in the course of the detailed description, the invention will now be described by reference to the accompanying drawin illustrating one form of construction which have devised for embodyingl the proposed improvements, after l which those features and combinations deemed to be novel will be set forth and claimed.

In the drawing- Figure 1 is a perspective view, with por- 60. tions broken away, illustrating a furnace and burner construction embodying the proposed features of improvement; and

Figure 2 is a vertical detail sectional view illustrating theburner and radiator assembly proper, on an enlarged scale, together with certain of the control of adjusting connections.

Referring now to the drawing in detail, this illustrates the improved furnace and burner construction as made up of a combination combustion and radiator structure corn- `prising a plurality of casting sections adapt- 'ber 5 the casting section 6 communicates with one or more upright casting sections 12, 12', 85 etc., joined together as indicated at 14, the lowermostsection 12 being formed with a Haring base flange 15 supported by means of thelegs 16 upon blockslf? of suitable fire clay or similar refractory and non-conductive material, which are supported upon the grate ring 18 at the bottom of the fire chamber. Thus, the upright casting sections provide a vertical assage 20 leading from the rear end of the orizonta-l passage 7, whereby the gases or products of combustion are conducted through'the lower outlet passages 22 afforded by the spaces between the legs 16 above the blocks 17.

At the outer end of the casting section G I provide a gas burner tube 24, preferably of the Venturi type and having a flange 25 for securing the same to the outer face of said casting, as by means of cap screws 26, with the discharge end of the tube 24 projecting within the passage 7, as represented in Figure 2. The other end of said tube 24 'is housed within a primary air intake chamber 28, where it is fitted with an air regulating cap 29 and a gas receiving or intake pipe 30. The outer end of the casting section 6 is also provided with a second air supply passage 31 for conducting secondary air to the passage 7, for the regulation of which air supply a damper 32 is provided, having a remote control connection 33; and for further regulation I provide the passage 31 with a sliding shutter 34 havingV an exterior handle 35 for convenient manual adjustment. A similar damper 36 having a remote control connection 37 is provided for regulating the primary air supply to the chamber 28.

A pilot gas burner is mounted through the flange'25 with its flame end adjacent the inner end of the tube 24, said burner 40 being provided with a supply pipe 41 and valve 42.

Provision is also made for burning oil, by means of an oil supply pipe 44, fitted with a manual valve 45 and automatic control valve 46, and connected so that the discharge end of the pipe 44 is positioned within the passage 7 past the Venturi throat portion 7 thereof. For affording an additional supply of air when burning oil, the front end of the passage 7 is provided with an air intakeopening 48 regulated by a sliding shutter 49 having the exterior handle 50.

It is also pro osed to provide an automatically controlle 'valve 52 as well as manual valve 54 for the gas pipe line 30, and remote control con-nections 47 and 53 for the'valves 46 and 52, respectively.

From the foregoing it will be apparent that I have provided a practical and efficient construction for carrying out the several desired objects o f my invention. It is well reeognized that the most effective method of heat transfer is by means of radiation, and the present burner casting assembly provides a construction in which there is an unusually ample heat radiation surface provided within the fire chamber, as the products of combustion traverse the spaces 7 and 20 within the castings; and as these hot gases are emitted.

from the lower end of the castings, by way of the openings 22, the walls of the fire bowl are again scrubbed by the upward travel of the gases, with this corresponding further opportunity for the transfer of heat by both conduction and convection. The central location of the burner casting assembly obviously also effects an even distribution of the heat which is given off during this travel of the gases on their way to the fiue. It will be seen also that the movement of the products of combustion is at a comparatively rapid rate, and is induced by a relatively slight pull or draft transmitted from the flue. In this connection it may be pointed out that the improved burner and casting assembly are adapted not only for what is known as atmospheric burner operation, but is equally adapted for power burner operation, of any of the various well known types, using a forced draft in conjunction with the chimney draft.

.It will also be noted that the air supplied for combustion is admitted by way of the burner unit, where it is most effective, and the ratio of the primary to the secondary air can be very accurately adjusted and regulated, which is an important advantage, for enabling the burner to be operated with either slow or quick burning gases. As shown in Figure 2, the provision for regulating the primary air to the burner element 24 isby means of the cap 29, but by providing also the primary air chamber 28 enclosing the outer end of the tube 24 and having the damper 26, it is apparent that this damper may be regulated by means of the connection 37, either for admitting air to the chamber 28, or for shutting off entirely the supply of primary air to the burner.

As already stated, the remote control connections to the several dampers and valves may beeither manually or automatically controlled (as by means of a thermostat-not shown), and in the case of a thermostat control the connections 33, 37, 47 and 53 may be operated by the same arm or lever on the thermostat for simultaneously lifting the connection's and thereby opening the dampers as well as the valves all in unison, or permitting the same to be simultaneously closed. Consequently, inthe event of closing of the valves 46 and 52, the same operation would result in the closing of the dampers 32 and 36, for shutting ofi' the outside air supply. The importance of this feature lies in the prevention of any excess air traveling into the burner chamber, with the attendant cooling effect, and consequent retarding of the burner action by delaying or slowing up the reigniting of the fuel when the valves are again opened. Of course the valve 45 is turned into closed position when oil is not being used. otherwise it is left open as illustrated in Figure 1. The valve 34 in the secondary air chamber 31 is adjusted to the proper point for obtaining the necessary vol- -ume of secondary air, in the preliminary 0peration of starting the burners, after which this position is iXed, and further regulation obtained by operation of the damper 32. The slide 49 is maintained in closed position unless oil is being burned, in which eventJ the slide is opened to a greater or less extent, according to the volume of air necessary for i the efficient operation of the oil burner. 4The" discharge point of the oil ,burner tube 4:4; is `positioned as illustrated, being that best adapted for the eiicientburning of the oil, as well as allowing any oil drippings to drain down the inner slope of the` Venturi throat and thence down into the fire bowl. it is necessary to have the gas burner operating so long as the oil is being used as fuel;v

in the construction illustrated, it is vobvious that the oil control connection 47 should be v"operated, preferably automatically, for siever the gas burner multaneously shutting off the iow of oil whenis shut ofi' by closing of the valve 52. v

Since the fire bowl is-` not only sealed against the admission of air from the fire pit,

but provided with a heat insulating lining by the.' refractory and non-conducting brick elements 17, there is no chilling of lthe air within the fire bowl by such directly admitted air; and likewise there is no waste heat allowed to escape yinto the ash pit, such as would only tend to retard the proper house air circulation. i

The construction of the radiator` casing sections is of a character as to present no manufacturing difficulties, and are in sectional units adapted for easy installation by way of the fire door, and adjustment into the proper position in symmetrical relation within the fire bowl.A It is alsc apparent that the radiator and burner assembly is adapted for installation in any type or shape of fire box,

I desire to reserve the right to make all such `Having thus described my invention, what fchan `es ormodifications as may fairly fall )withinl the scope of the appended claims.

claim and desire to secure by Letters Patent is:

1. A furnace and burner construction comprising, in combination with the ire bowl of the furnace, a radiator member mounted within said bowl and provided with a burner assembled therewith byway of the fire door, means for supplying fuel and air to the Since l burner, and. means providing a `heat insulation lining for the bottom of the fire bowl and the bottom of the bowl, and av burner communicating with said horizontal passage by way of the fire door.

3. A furnace and burner construction comi prising, in combination with the fire bowl of the furnace, a sectional radiator member comprising a horizontal casting section and one or more vertical casting sections adapted to be assembled within the fire bowl by way of the fire door, and providing an initial horizontal'passage and a vertical passage for the travel of the combustion gases and discharging the same at the bottom of the bowl, and a burner communicating with the outer end of said horizontal casting section.

4. A furnace and burner construction comprising, in combination with the fire bowl of the furnace. a sectional radiator member comprising a Venturi-throated horizontal casting section and one or more vertical casting sections. adapted to be assembledl within the bowl by way of the fire door with said vertical castingI sections positioned centrally within the bowl, and a burner assembled in connection with the outer end of said horizontal casting section.

5. A furnace and burner construction comprising, in combination with the tire bowl of the furnace, a radiator assembly mounted within the fire bowl, separate gas and oil fuel 4 burning elements mounted in connection with said radiator assembly, and means for regulating the operation of said burner elements independently of each other. r .6. A furnace and burner construction com prising. in combination with the {ire bowl of the furnace, a radiator assembly mounted within the fire bowl, separate gas and oil fuel burning elements mounted in connection with said radiator assembly, and independent remote control means for `regulating both the fuel and air supply -to said burner elements.

7. A furnace and burner construction c'omprising.v in combination with the fire bowl of the furnace, a sectional radiator member comprising a Venturi-.throated horizontal casting section and one "or more vertical casting sections positioned-centrally within most constricted portion of the passage therethrough.

8. A furnace and burner construction comprising, in combination with the fire bowl of the. furnace` a sectional radiator member comprisingu Vcnturithroated horizontal castingr sect-ion und one or more Vertical castingsections positioned centrally Within the bowl,`

und a burner assembly comprising a gas burner tube connected with the outer end of said horizontal section, und a liquid fuel burner tube having its discharge end projecting into said horizontal section to a point past the most constricted portion of the pas- Sagre therethrough.

In witness whereof I hereunto affix my signature.

ELlVIN E. MCGILL. 

